A crew at the department of transportation garage make minor repairs to snow plows during the winter. The snowplows break down at an average rate of 4 vehicles per day and break down at an average of 7 vehicles per day with a repair time distribution that approximates a negative exponential distribution. Assume an 8 hour day What is the utilization rate for the mechanic? What is the average time that a snowplow wait before the mechanic can begin his repair? Approximately how many vehicles are in the garage, waiting for repairs or being repaired